KR950008899B1 - Green color masterbatch compositions for polyethylene terephthalate - Google Patents

Abstract

The green color master batch composition of a polyethylene terepl thalate(PET) is composed of 100 wt.% polyethylene terephthalate resin having 0.5-0.85 intrinsic viscosity, 0.6-0.85 wt.% pyrazolone yellow, 0.2-0.35 wt.% phthalocyanine blue and 0.8-2.0 wt.% substd. benzotriazole as a ultraviolet absorbent. The transparent PET bottle for soft drinks, having a good green color distinction and ultraviolet-shieldability, is mfd. by adding 5 wt.% master batch composition to 95 wt.% PET resin, and blow injection molding the mixture.

Description

Green Batch Master Batch Composition of Polyethylene Terephthalate

1 is a graph showing the ultraviolet and visible light transmittance of the product obtained in Example 4 according to the present invention,

2 is a graph showing the ultraviolet and visible light transmittance of the product obtained in Comparative Example 7 according to the prior art.

The present invention relates to a green color masterbatch composition of polyethylene terephthalate, and more particularly, polyethylene terephthalate (hereinafter, abbreviated as "PET"). It relates to a green color masterbatch composition of PET that expresses and protects the contents of the bottle from ultraviolet light.

In general, PET water is widely used in soft drinks, liquor, and medicine bottles as a substitute for glass bottles because of its excellent properties such as non-toxicity, chemical resistance, transparency, and light weight. Especially, transparent PET bottles are often used in soft drinks bottles with green color in appearance. do.

When manufacturing a conventional green-colored PET bottle, the masterbatch of phthalocyanine-based green pigment is directly added or anthraquinone or disazo yellow pigment is mixed with a phthalocyanine-based blue pigment. The bottle was prepared by injecting the mixture.

However, in the former case, since the pigment itself is directly injected during the injection process, the workability is poor due to contamination due to the blowing of the pigment and the dispersion of the pigment is poor.

In addition, in the latter case, the UV blocking rate of the wavelength of 300 ~ 400nm falls and adds an ultraviolet absorber to overcome this, but absorbs ultraviolet rays of 300 ~ 380nm but has no absorption effect on the ultraviolet rays of 380 ~ 400nm.

Accordingly, the present invention, unlike the prior art, in the PET masterbatch composition, by adding a phthalocyanine-based blue pigment to the yellow pigment of the pyrazolone system to the PET resin, carbohydrate-substituted benzotriazole (Benzotriazole) is appropriately mixed By doing so, the purpose is to provide a PET green color masterbatch composition with a clear green color and excellent UV protection.

Hereinafter, the present invention will be described in detail.

The present invention provides a polyethylene terephthalate masterbatch composition having a green color, comprising: 0.6 to 0.85 parts by weight of pyrazolone yellow, 0.2 to 0.35 parts by weight of phthalocyanine blue, and 100 parts by weight of polyethylene terephthalate resin having an intrinsic viscosity of .0.5 to 0.85. It is a polyethylene terephthalate masterbatch composition characterized by containing 0.8-2 weight part of substituted benzotriazoles.

As such, pellets prepared by concentrating the above components in a PET resin are called PET master batches. In fact, when manufacturing a PET resin bottle, the PET resin is prepared by mixing the PET resin with the PET resin during the blowing injection process. In this case, PET master batch is used by mixing 3 to 8% by weight.

Referring to the present invention in more detail as follows.

PET resin used in the PET masterbatch composition according to the present invention uses a viscosity of 0.5 to 0.85 bar viscosity is less than 0.5 and the moldability is not good because the defect rate is higher than 0.85 flowability of the masterbatch itself Fall off and adversely affect the pigment dispersion in the composition.

The yellow pigment of the pyrazolone system, which is characteristically used in the present invention, is required for expressing the green color and is effective for absorbing light in the wavelength range of 380 to 400 nm among ultraviolet rays, which are short wavelengths. The amount used is less than 0.6 parts by weight, the UV protection effect of 380 ~ 400nm is lowered, and when used in excess of 0.85 parts by weight, the color vividness and transmittance of the color falls.

In addition, phthalocyanine blue pigment is used to determine green color expression and chromaticity, and in order to make green color, it should not use more than 0.25 parts by weight but less than 0.25 parts by weight because it should show light transmittance of 25% or more and less than 40% at 610nm. .

Substituted benzotriazole used as a UV absorber is effective for absorbing ultraviolet rays of 300 ~ 380nm wavelength, and when used below 0.8 parts by weight, UV blocking effect is lowered. When used more than 2 parts by weight, UV blocking effect is very good. The pattern of pimples or gas in the mold is severe and may cause process defects.

In general, the UV wavelength range is 300 ~ 400nm, in order to protect the contents of the transparent bottle, less than 5% UV transmission at each wavelength of this section is limited, 95% or more of UV light should be blocked, PET master arrangement according to the present invention By using this can satisfactorily satisfy these conditions.

According to the present invention according to the present invention PET master batch used in the manufacturing of the bottle as described above can be used to adjust to 3 to 8% by weight relative to the total amount of PET resin for bottle manufacturing according to the thickness and color of the PET bottle to be prepared, If less than 3% by weight, the UV blocking rate is lowered and the color becomes lighter. If it is added in excess of 8% by weight, the UV blocking rate is improved, but the color becomes too dark to produce a fresh bottle, and thus there is no product value.

In addition, the green color diagram of the bottle, that is, transparency is transmitted at 80% or more when the transmittance at 800 nm, the wavelength of 400 to 800 nm, the wavelength range of visible light, is 0.2 to 0.5 nm. If more than 45% less than the transmission can be said to be excellent green color PET bottle, PET masterbatch of the present invention can satisfy these conditions.

As described above, the present invention, unlike the prior art in the PET green color master batch composition is mixed with pyrazolone pigments, phthalocyanine, and substituted benzotriazole in an appropriate range, when used to provide excellent gran color and UV protection It is possible to produce a PET resin bottle.

Hereinafter, the present invention will be described in detail with reference to Examples.

After drying the PET resin having an intrinsic viscosity of 0.7 at 140 ° C. for 6 hours, the pyrazolone yellow pigment / phthalocyanine blue pigment / substituted benzotriazole was uniformly mixed for 15 minutes in a fully sealed tumbler according to Table 1 After the extrusion, the pellet is extruded at a process temperature of 270 ° C. and rpm 300 at a process temperature of 270 ° C. in a twin extruder having a diameter of φ35 mm and L / D32.

The pellet (PET green color masterbatch) was dried at 140 ° C. for 4 hours, and then 5% by weight was added to 95% by weight of PET resin having an intrinsic viscosity of 0.7 to prepare a bottle in a blow molding machine (Nissei ASB100). (Bottle thickness 0.35mm)

[Comparative Examples 1-6]

Except for the type and content of each component as shown in Table 2 was carried out in the same manner as in Example 1.

[Comparative Examples 7-9]

Composition Anthraquinone yellow / phthalocyanine blue / substituted benzotriazole was performed in the same manner as in Example 1 except that the content of Table 3 was used.

[Comparative Examples 10-12]

A phthalocyanine-based green pigment and a substituted benzotriazole were carried out in the same manner as in Example 1 except that the contents of Table 4 were used.

After taking specimens 2 cm wide, 3 cm wide, and 0.35 mm thick from the bottles prepared in Examples and Comparative Examples, a light transmittance of 300 to 800 nm was measured on a UV / VIS spectrometer (Perkin Elmer), and The results of scratches on the diseased surface are shown in Table 5 below.

Meanwhile, the UV transmittance of the product prepared in Example 4 is as shown in FIG. 1, and the UV transmittance of the product prepared in Comparative Example 7 is shown in FIG. In the UV wavelength range of 300 to 400 nm, the transmittance within 4% is shown while FIG. 2 shows the transmittance up to about 35%. Thus, Example 4 using the PET masterbatch according to the present invention is a comparative example of the prior art. Compared to 7, it can be seen that the UV blocking performance is very excellent.

Claims (2)

In the polyethylene terephthalate masterbatch composition having a green color, 0.6 to 0.85 parts by weight of parazolon yellow, 0.2 to 0.35 parts by weight of phthalocyanine blue, and substituted benzotriazole 0.8 are contained in 100 parts by weight of polyethylene terephthalate resin having an intrinsic viscosity of 0.5 to 0.85. The polyethylene terephthalate masterbatch composition characterized by including 2 weight part. In the polyethylene terephthalate resin bottle containing the masterbatch composition, 100 parts by weight of polyethylene terephthalate resin having an intrinsic occupancy of 0.5 to 0.85 parts by weight of pyrazolone yellow, 0.2 to 0.35 parts by weight of phthalocyanine blue, A polyethylene terephthalate resin bottle, wherein 3 to 8% by weight of a green color master batch composition containing 0.8 to 2 parts by weight of substituted benzotriazole is mixed.